title: Possible DNS Tunneling
status: experimental
description: Normally, DNS logs contain a limited amount of different dns queries for a single domain. This rule detects a high amount of queries for a single domain, which can be an indicator that DNS is used to transfer data. 
references:
    - https://zeltser.com/c2-dns-tunneling/
    - https://patrick-bareiss.com/detect-c2-traffic-over-dns-using-sigma/
author: Patrick Bareiss
date: 2019/04/07
logsource:
    product: dns
detection:
    selection:
        parent_domain: '*'
    condition: selection | count(dns_query) by parent_domain > 1000
falsepositives:
    - Valid software, which uses dns for transferring data
level: high
tags:
    - attack.t1043